EP1879351A2 - Method and apparatus for data framing in a wireless communications system - Google Patents
Method and apparatus for data framing in a wireless communications system Download PDFInfo
- Publication number
- EP1879351A2 EP1879351A2 EP07011987A EP07011987A EP1879351A2 EP 1879351 A2 EP1879351 A2 EP 1879351A2 EP 07011987 A EP07011987 A EP 07011987A EP 07011987 A EP07011987 A EP 07011987A EP 1879351 A2 EP1879351 A2 EP 1879351A2
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- EP
- European Patent Office
- Prior art keywords
- protocol entity
- communications device
- sequence number
- entity
- protocol
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0079—Formats for control data
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/16—Implementing security features at a particular protocol layer
- H04L63/162—Implementing security features at a particular protocol layer at the data link layer
Definitions
- the present invention relates to a method of data framing and related communications device according to the pre-characterizing clause of claim 1.
- 3G mobile telecommunications system
- 3GPP TS 33.102 3G Security; Security architecture
- 3G 3G Security; Security architecture
- User data confidentiality is a security features
- a stream cipher using a derived cipher key is a security mechanism that realizes the user data confidentiality security feature.
- user plane data are ciphered using a cipher key
- control plane data are ciphered and integrity protected using a cipher key and an integrity key, respectively.
- Integrity protection, hereafter IP applied at a radio resource control, hereafter RRC, layer uses an RRC sequence number, hereafter RRC SN.
- the RRC SN is incremented for every integrity protected RRC message and its length is 4-bits.
- RLC SN handles IP and ciphering, respectively.
- RLC PDU contains the RRC SN and an RLC SN. This wastes radio resources when transmitting integrity protected RRC messages.
- the present invention aims at providing a method of data framing and related communications device that conserves radio resources.
- the claimed method of data framing and related communications device includes reusing a sequence number in a second protocol entity for a predetermined function.
- the third generation, hereafter 3G, mobile telecommunications system has adopted a Wideband Code Division Multiple Access, hereafter WCDMA, wireless air interface access method for a cellular network.
- WCDMA provides high frequency spectrum utilization, universal coverage, and high quality, high-speed multimedia data transmission.
- the WCDMA method also meets all kinds of QoS requirements simultaneously, providing diverse, flexible, two-way transmission services and better communication quality to reduce transmission interruption rates.
- a user can utilize a wireless communications device, such as a mobile phone, to realize real-time video communications, conference calls, real-time games, online music broadcasts, and email sending/receiving.
- a wireless communications device such as a mobile phone
- these functions rely on fast, instantaneous transmission.
- HSDPA High Speed Downlink Package Access
- HSUPA High Speed Uplink Package Access
- a mobile equipment hereafter ME
- a radio network controller hereafter RNC
- RNC radio network controller
- an integrity parameter COUNT-I is 32 bits long.
- One COUNT-I value is used for each uplink signaling radio bearer, hereafter SRB, i.e. RB 0-4, and one COUNT-I value is used for each downlink SRB.
- COUNT-I has two parts: a short sequence number (4 bits long), and a long sequence number (28 bits long).
- the short sequence number is the 4-bit RRC SN available in each RRC PDU, whereas the long sequence number is the 28-bit RRC HFN, which is incremented at each RRC SN cycle.
- RRC Radio Resource Control
- UE user equipment
- UTRAN UMTS terrestrial radio access network
- unacknowledged mode data hereafter UMD, PDU headers and acknowledged mode data PDU headers include an RLC SN, which is different from the RRC SN.
- the RLC SN is used for ciphering, as well as for transmission using a window function.
- Section 9.2.2.3 of 3GPP TS 25.322 V7.0.0, "Radio Link Control (RLC) (Release 7)” the RLC SN for the AMD PDU is 12 bits long, whereas the RLC SN for the UMD PDU is 7 bits long.
- Fig. 1 is a function block diagram of a communications device 100.
- Fig. 1 only shows an input device 102, an output device 104, a control circuit 106, a central processing unit, hereafter CPU, 108, a memory 110, a program code 112, and a transceiver 114 of the communications device 100.
- the control circuit 106 executes the program code 112 in the memory 110 through the CPU 108, thereby controlling an operation of the communications device 100.
- the communications device 100 can receive signals input by a user through the input device 102, such as a keyboard, and can output images and sounds through the output device 104, such as a monitor or speakers.
- the transceiver 114 is used to receive and transmit wireless signals, delivering received signals to the control circuit 106, and outputting signals generated by the control circuit 106 wirelessly. From a perspective of a communications protocol framework, the transceiver 114 can be seen as a portion of Layer 1, and the control circuit 106 can be utilized to realize functions of Layer 2 and Layer 3. Preferably, the communications device 100 is utilized in a third generation, hereafter 3G, mobile communications system.
- 3G third generation
- Fig. 2 is a diagram of the program code 112 shown in Fig. 1.
- the program code 112 includes an application layer 200, a Layer 3 202, and a Layer 2 206, and is coupled to a Layer 1 218.
- An RRC entity 222 is located in the Layer 3 202, and an RLC entity 226 is located in the Layer 2 206.
- the RRC entity 222 is responsible for, among other things, control of requested QoS, control of ciphering, and RRC message IP.
- the RLC entity 226 is a lower layer entity to the RRC entity 222.
- the RLC entity 226 is split into a transmitting side and a receiving side.
- the transmitting side receives RLC SDUs from upper layers through an AM service access point, hereafter AM-SAP.
- the RLC SDUs are concatenated or segmented to AMD PDUs of a predetermined length.
- the AMD PDUs are placed in a retransmission buffer and a MUX.
- the MUX multiplexes AMD PDUs from the retransmission buffer and AMD PDUs that are newly segmented/concatenated.
- a function then completes a header on the AMD PDUs.
- the transmission side of the RLC entity 226 sends the AMD PDUs to a lower layer, e.g. a medium access control, hereafter MAC, layer, through a logical channel.
- the program code 112 comprises a data framing program code 220.
- FIG. 3 is a flowchart of a process 30 according to a first embodiment of the present invention.
- the process 30 is utilized for data framing in the wireless communications system, and can be compiled into the data framing program code 220.
- the process 30 comprises the following steps:
- the second protocol entity could be the RLC entity 226, the MAC entity, or both.
- the first protocol entity could be the RRC entity 222.
- the security function could be ciphering or integrity protection.
- the predetermined function could be automatic retransmission request, hereafter ARQ, hybrid ARQ, hereafter HARQ, ciphering, in-sequence delivery, or duplicate detection.
- the second protocol entity i.e. the RLC entity or the MAC entity, could also reuse the sequence number by adding extension bits to the sequence number for concatenation or segmentation.
- each PDU of the first protocol entity i.e. the RRC entity 222, should have one sequence number.
- the present invention is able to conserve radio resources, and the method is also simpler to implement compared to the prior art.
Abstract
To conserve radio resources in a wireless communications system through sequence number reuse, a method of performing data framing uses a sequence number in a first protocol entity as a parameter of a security function (302), then reuses the sequence number in a second protocol entity for a predetermined function (304). The second protocol entity is a lower layer of the first protocol entity.
Description
- This application claims the benefit of the filing date of
U.S. Provisional Patent Application No. 60/805,342, filed on June 21, 2006 - The present invention relates to a method of data framing and related communications device according to the pre-characterizing clause of
claim 1. - In a 3rd generation, hereafter 3G, mobile telecommunications system, 3GPP TS 33.102, "3G Security; Security architecture," defines a security architecture for the 3G mobile telecommunications system. User data confidentiality is a security features, and a stream cipher using a derived cipher key is a security mechanism that realizes the user data confidentiality security feature. In the 3G mobile telecommunications system, user plane data are ciphered using a cipher key, and control plane data are ciphered and integrity protected using a cipher key and an integrity key, respectively. Integrity protection, hereafter IP, applied at a radio resource control, hereafter RRC, layer uses an RRC sequence number, hereafter RRC SN. The RRC SN is incremented for every integrity protected RRC message and its length is 4-bits.
- In the prior art, the RRC SN and a radio link control SN, hereafter RLC SN, handle IP and ciphering, respectively. A corresponding RLC protocol data unit, hereafter RLC PDU, contains the RRC SN and an RLC SN. This wastes radio resources when transmitting integrity protected RRC messages.
- This in mind, the present invention aims at providing a method of data framing and related communications device that conserves radio resources.
- This is achieved by a method of data framing and related communications device according to
claims - As will be seen more clearly from the detailed description following below, the claimed method of data framing and related communications device includes reusing a sequence number in a second protocol entity for a predetermined function.
- In the following, the invention is further illustrated by way of example, taking reference to the accompanying drawings. Thereof
- Fig. 1 is a function block diagram of a wireless communications device,
- Fig. 2 is a diagram of program code of Fig. 1, and
- Fig. 3 is a flowchart of a process according to a first embodiment of the present invention.
- The third generation, hereafter 3G, mobile telecommunications system has adopted a Wideband Code Division Multiple Access, hereafter WCDMA, wireless air interface access method for a cellular network. WCDMA provides high frequency spectrum utilization, universal coverage, and high quality, high-speed multimedia data transmission.
- The WCDMA method also meets all kinds of QoS requirements simultaneously, providing diverse, flexible, two-way transmission services and better communication quality to reduce transmission interruption rates.
- Through the 3G mobile telecommunications system, a user can utilize a wireless communications device, such as a mobile phone, to realize real-time video communications, conference calls, real-time games, online music broadcasts, and email sending/receiving. However, these functions rely on fast, instantaneous transmission. Thus, targeting third generation mobile telecommunication technology, the prior art provides High Speed Downlink Package Access, hereafter HSDPA, and High Speed Uplink Package Access, hereafter HSUPA, which are used to increase bandwidth utility rate and package data processing efficiency to improve uplink/downlink transmission rate.
- According to Section 6.4.8 of TS 33.102, a mobile equipment, hereafter ME, and a radio network controller, hereafter RNC, initialize 20 most significant bits of an RRC hyper frame number, hereafter HFN, for integrity protection, a radio link control, hereafter RLC, HFN for ciphering, and a dedicated medium access control, hereafter MAC-d, HFN for ciphering to a START value of a corresponding service domain. Remaining bits are initialized to 0. And, the RRC SN for integrity protection and the RLC SN for ciphering are also initialized to 0.
According to Section 6.5.2, IP is applied at the RRC layer. - Regarding an integrity algorithm used for realizing IP, an integrity parameter COUNT-I is 32 bits long. One COUNT-I value is used for each uplink signaling radio bearer, hereafter SRB, i.e. RB 0-4, and one COUNT-I value is used for each downlink SRB. COUNT-I has two parts: a short sequence number (4 bits long), and a long sequence number (28 bits long). The short sequence number is the 4-bit RRC SN available in each RRC PDU, whereas the long sequence number is the 28-bit RRC HFN, which is incremented at each RRC SN cycle.
- In 3GPP TS 25.331 V7.0.0, "Radio Resource Control (RRC) (Release 7)," Section 8.5.10 further describes IP. When IP is first activated for an RRC connection, a user equipment, hereafter UE, and a UMTS terrestrial radio access network, hereafter UTRAN, initialize an uplink RRC SN and a downlink RRC SN for all SRBs. The RRC SN is incremented for each integrity protected RRC message.
- Finally, unacknowledged mode data, hereafter UMD, PDU headers and acknowledged mode data PDU headers include an RLC SN, which is different from the RRC SN. The RLC SN is used for ciphering, as well as for transmission using a window function. According to Section 9.2.2.3 of 3GPP TS 25.322 V7.0.0, "Radio Link Control (RLC) (Release 7)," the RLC SN for the AMD PDU is 12 bits long, whereas the RLC SN for the UMD PDU is 7 bits long.
- Please refer to Fig. 1, which is a function block diagram of a
communications device 100. For the sake of brevity, Fig. 1 only shows aninput device 102, anoutput device 104, acontrol circuit 106, a central processing unit, hereafter CPU, 108, amemory 110, aprogram code 112, and atransceiver 114 of thecommunications device 100. In thecommunications device 100, thecontrol circuit 106 executes theprogram code 112 in thememory 110 through theCPU 108, thereby controlling an operation of thecommunications device 100. Thecommunications device 100 can receive signals input by a user through theinput device 102, such as a keyboard, and can output images and sounds through theoutput device 104, such as a monitor or speakers. Thetransceiver 114 is used to receive and transmit wireless signals, delivering received signals to thecontrol circuit 106, and outputting signals generated by thecontrol circuit 106 wirelessly. From a perspective of a communications protocol framework, thetransceiver 114 can be seen as a portion ofLayer 1, and thecontrol circuit 106 can be utilized to realize functions ofLayer 2 andLayer 3. Preferably, thecommunications device 100 is utilized in a third generation, hereafter 3G, mobile communications system. - Please continue to refer to Fig. 2. Fig. 2 is a diagram of the
program code 112 shown in Fig. 1. Theprogram code 112 includes anapplication layer 200, aLayer 3 202, and aLayer 2 206, and is coupled to aLayer 1 218. AnRRC entity 222 is located in theLayer 3 202, and anRLC entity 226 is located in theLayer 2 206. The RRCentity 222 is responsible for, among other things, control of requested QoS, control of ciphering, and RRC message IP. TheRLC entity 226 is a lower layer entity to theRRC entity 222. - in acknowledged mode, hereafter AM, the
RLC entity 226 is split into a transmitting side and a receiving side. The transmitting side receives RLC SDUs from upper layers through an AM service access point, hereafter AM-SAP. The RLC SDUs are concatenated or segmented to AMD PDUs of a predetermined length. Then, the AMD PDUs are placed in a retransmission buffer and a MUX. The MUX multiplexes AMD PDUs from the retransmission buffer and AMD PDUs that are newly segmented/concatenated. A function then completes a header on the AMD PDUs. Then, the transmission side of the RLCentity 226 sends the AMD PDUs to a lower layer, e.g. a medium access control, hereafter MAC, layer, through a logical channel. To increase efficiency, theprogram code 112 comprises a dataframing program code 220. - Please refer to Fig. 3, which is a flowchart of a
process 30 according to a first embodiment of the present invention. Theprocess 30 is utilized for data framing in the wireless communications system, and can be compiled into the dataframing program code 220. Theprocess 30 comprises the following steps: - Step 300: Start.
- Step 302: Use a sequence number in a first protocol entity as a parameter of a security function.
- Step 304: Reuse the sequence number in a second protocol entity for a predetermined function.
- Step 306: End.
- In the
process 30, the second protocol entity could be theRLC entity 226, the MAC entity, or both. The first protocol entity could be theRRC entity 222. InStep 302, the security function could be ciphering or integrity protection. And, inStep 304, the predetermined function could be automatic retransmission request, hereafter ARQ, hybrid ARQ, hereafter HARQ, ciphering, in-sequence delivery, or duplicate detection. The second protocol entity, i.e. the RLC entity or the MAC entity, could also reuse the sequence number by adding extension bits to the sequence number for concatenation or segmentation. Finally, each PDU of the first protocol entity, i.e. theRRC entity 222, should have one sequence number. - In summary, by reusing the RRC SN in each RRC PDU to perform ARQ, HARQ, ciphering,' in-sequence delivery, and duplicate detection in the RLC entity, the present invention is able to conserve radio resources, and the method is also simpler to implement compared to the prior art.
Claims (10)
- A method of performing data framing in a wireless communications system, the method comprising:using a sequence number in a first protocol entity as a parameter of a security function (302); andcharacterized by:reusing the sequence number in a second protocol entity for a predetermined function (304), wherein the second protocol entity is a lower layer of the first protocol entity.
- A communications device (100) utilized in a wireless communications system for performing data framing, the communications device comprising:a control circuit (106) for realizing functions of the communications device;a central processing unit (108) installed in the control circuit for executing program codes to operate the control circuit; anda memory (110) coupled to the central processing unit and comprising:characterized by the memory further comprising:program code executed for using a sequence number in a first protocol entity as a parameter of a security function (302); andprogram code executed for reusing the sequence number in a second protocol entity for a predetermined function (304), wherein the second protocol entity is a lower layer of the first protocol entity.
- The method of claim 1 and the communications device of claim 2, characterized in that the said second protocol entity can be more than one.
- The method of claim 1 and the communications device of claim 2, characterized in that the second protocol entity reuses the sequence number by adding a plurality of extension bits to the sequence number for segmentation or concatenation.
- The method of claim 1 and the communications device of claim 2, characterized in that each protocol data unit of the first protocol entity has a corresponding sequence number.
- The method of claim 1 and the communications device of claim 2, characterized in that the first protocol entity is a Radio Resource Control entity.
- The method of claim 1 and the communications device of claim 2, characterized in that the second protocol entity is a Radio Link Control entity or a Medium Access Control entity.
- The method of claim 1 and the communications device of claim 2, characterized in that the said security function is ciphering.
- The method of claim 1 and the communications device of claim 2, characterized in that the said security function is integrity protection.
- The method of claim 1 and the communications device of claim 2, characterized in that the predetermined function is Automatic Retransmission Request, Hybrid Automatic Repeat Request, ciphering, in-sequence delivery, or duplicate detection.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US80534206P | 2006-06-21 | 2006-06-21 |
Publications (1)
Publication Number | Publication Date |
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EP1879351A2 true EP1879351A2 (en) | 2008-01-16 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP07011987A Withdrawn EP1879351A2 (en) | 2006-06-21 | 2007-06-19 | Method and apparatus for data framing in a wireless communications system |
Country Status (5)
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EP (1) | EP1879351A2 (en) |
JP (1) | JP2008005505A (en) |
KR (1) | KR20070121538A (en) |
CN (1) | CN101102538A (en) |
TW (1) | TW200814682A (en) |
Families Citing this family (1)
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TWI699990B (en) * | 2019-04-02 | 2020-07-21 | 俊華電子企業股份有限公司 | Lightweight remote control communication protocol signal transmission method |
-
2007
- 2007-06-19 EP EP07011987A patent/EP1879351A2/en not_active Withdrawn
- 2007-06-20 KR KR1020070060381A patent/KR20070121538A/en not_active Application Discontinuation
- 2007-06-21 TW TW096122303A patent/TW200814682A/en unknown
- 2007-06-21 CN CNA2007101122218A patent/CN101102538A/en active Pending
- 2007-06-21 JP JP2007164262A patent/JP2008005505A/en not_active Withdrawn
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Publication number | Publication date |
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TW200814682A (en) | 2008-03-16 |
KR20070121538A (en) | 2007-12-27 |
JP2008005505A (en) | 2008-01-10 |
CN101102538A (en) | 2008-01-09 |
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